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Withings is great if you're looking for "health" watch but not really good as fitness tracker.

For years, I used my steel HR (got a weird one branded Nokia because they had purchased Withings only to resell Withings to the founder a year later), loved the sleep tracking, health report etc... But the activity tracking wasn't the best, especially running.

However the battery's life is out of this world. I loved the mix between tech and good old watch.

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I bought a Scanwatch and have found the health data to be so inaccurate as to be completely useless. I explicitly wanted SpO2 and sleep tracking and it's just very wrong. It would wake up multiple times at night and the watch would tell me I was asleep all night. I'm sure it's just some limitation of the sensors, but the tech just isn't good enough to be useful

That's a common problem. If you search google scholar for sleep tracking accuracy you will find that many smart watches are good at detecting sleep, but not so great at detecting you waking up, so they overestimate sleep time and sleep efficiency. And any sleep phase "measurements" are best ignored entirely.

The Fitbit Alta HR and the Apple Watch are worth mentioning for tracking sleep time and wake ups fairly accurately.

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